. >>> on the indiana/kentucky border, frustration. >> where are the public officials going to assume the responsibility of their elected office. >> reporter: after engineers found cracks in steel support beams on the sherman minten bridge over the ohio river, the governors of both states shut it down. >> we are convinced it is the only responsible decision to make. >> reporter: the latest sign of an underfunded, undermaintained infrastructure. >> one in nine bridges is deficient. every second of every day an american driver crosses a deficient bridge that is in bad need of repair. >> reporter: transportation for america reports that 11.5% of the nation's bridges, more than 69,000, are now structurally deficient, requiring repair or replacement. pennsylvania has the most, 5900 bridges in need of repair. >> there are private construction companies all across america just waiting to get to work. there is a bridge that needs repair between ohio and kentucky that is on one of the busiest trucking routes in north america. >> reporter: that's the brent spence bridge in cincinnati in the bac